Kavli Affiliate: Roland Vanderspek
| First 5 Authors: Akihiko Fukui, Tadahiro Kimura, Teruyuki Hirano, Norio Narita, Takanori Kodama
| Summary:
We report the discovery of TOI-2285b, a sub-Neptune-sized planet transiting a
nearby (42 pc) M dwarf with a period of 27.3 days. We identified the transit
signal from the Transiting Exoplanet Survey Satellite photometric data, which
we confirmed with ground-based photometric observations using the multiband
imagers MuSCAT2 and MuSCAT3. Combining these data with other follow-up
observations including high resolution spectroscopy with the Tillinghast
Reflector Echelle Spectrograph, high resolution imaging with the SPeckle
Polarimeter, and radial velocity (RV) measurements with the InfraRed Doppler
instrument, we find that the planet has a radius of 1.74 $pm$ 0.08 $R_oplus$,
a mass of $<$ 19.5 $M_oplus$ (95% c.l.), and an insolation flux of 1.54 $pm$
0.14 times that of the Earth. Although the planet resides just outside the
habitable zone for a rocky planet, if the planet harbors an H$_2$O layer under
a hydrogen-rich atmosphere, then liquid water could exist on the surface of the
H$_2$O layer depending on the planetary mass and water mass fraction. The
bright host star in the near infrared ($K_s=9.0$) makes this planet an
excellent target for further RV and atmospheric observations to improve our
understanding on the composition, formation, and habitability of
sub-Neptune-sized planets.
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